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Best answer

Think.http://pokemondb.net/type/dual
These types have no effect on Dark pokemon:
PSYCHIC
These types are not very effective against Dark pokemon:
GHOST DARK
These types are super-effective against Dark pokemon:
FIGHTING BUG

These types have no effect on Ghost pokemon:
NORMAL FIGHTING
These types are not very effective against Ghost pokemon:
POISON BUG
These types are super-effective against Ghost pokemon:
GHOST DARK

Ghost cancel's dark's weakness. Ghost and dark aren't very effective on dark, but super effective on ghost, thus making it even. Bug isn't very effective on ghost, but super effective on dark, thus making it even. Fighting is super effective on dark but has no effect on ghost, thus canceling it out.